Samuel k



j @uiten gestes geteilt @ffice Letters Patent No. 79,710, dated July 7,1868.

IMPROVEMENT IN HYDRAULIC RANES.

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KNOW'ALL MEN BY THESE PRESENTS:

That I, SAMUEL KQ WELLMAN, of Nashua, in .the county of Hillsborough,and State of New Hampshire, have invented certain new and usefulImprovements in Hydraulic Cranes; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawings, forming a part of thisspecification, in which- Figure 1 represents a side View of a cranehaving my improvements applied thereto.

Figure 2 represents a vertical section on line C D.

Figure 3 represents a horizontal section on line A B, fig. 1.

Figurei represents, upon an enlarged scale, a vertical section throughthe joint or connection'ut the bottom of the crane-post.

Figure 5 representsA a section on line A B as it would appear if thepost were made round; and

Figure 6 represents a vertical section through thepeculiarly-constructed elastic cushion used for easing the draught uponthe crane.

To enable those skilled in the art to which my invention belongs to makeand use the same, I will proceed to describe it more in detail. l

In the drawings, e is the crane-post, made, in this instauee,.inrectangulaishape, said post to be properly supported at top and bottom.The base of the post c lia-s a front projection, b, to the top of whichis fitted the cylinder c, in the bore of which fits the piston H,fastened to the husk-case orshell d, which is fitted to slide up anddown ou the post e,' the cranearm r, and its truss-rods ff and brace gg, being connected with the husk (Z, so that when the latter is raisedor lowered they will be raised and lowered.

The bottom of post e is supported upon a permanent and secure base, A, atube, B, being screwed into the bottom thereof. Nut 1 is slipped onAtube B, before the latter is screwed into thc bottom of post e.

The lower end of tube Bis provided with shoulders 2 and 3, and the nut 4is slipped on to the lower end of tube B, and screwed on to the lowerend of nut 1, after which a leather packing, 5, is slipped on to the endo tube B, and the knee a is then screwed into the lower end of uut d,until it presses the outer edge, G, of the leather packing firm againstthe shoulder' 7 in the nut'i. l l

The hole in the upper end of the knee ais cored or bored out larger thanthe tube B, whereby the leather packing 5 is allowed to occupy therelative position, as fully shown in iig. 4 of the drawings.

It will be seen that the 'ecct of the pressure of the water, as it isforced. into the cylinder c through pipe S, knee a, and pipe B, will beto close the packing 5 upon the end of the tube, `and u p against theshoulder 3, and thus make a tight joint, whil'eat the same time the pipeB is left free to turn with the crane-post e.

The water may be conveyed from the base of the crane-post to thecylinder. e, by a lside pipe, 9, or any other suitablearrangement may beemployed for that purpose. V

In iig. 1, the crane-post is represented in rectangular form, but itmaybe made round, as shown in tig. 5 in which case the husk would bemade of corresponding shape, as shown in the same ligure.

When cranes are used to support large masses or hars, C, of metal duringthe operation of forging the same, or a part thereof, under largehammers, -much injury results to the iron and other portions of thecrane, in consequence of the jarring occasioned by the strokes or blowsof the hammer. Y

To remedy the said objections', I make the bottom, 11, of Vthe carriage1t in the proper form to receive the case O of the. cushion O', in whichis placed, first, e. layer of rubber, t, then a metal xpiece, u, thenanother disk of rubber, and on the top piece of rubber is placed thestrong met-al cap lt. `The rod I), which supports the windlass S, passesup through the rubber and metal disks, and is held oy a strong` nut,which rests uporrthe cap-piece R, whereby there is an elastic mediuminterposed between metal C, whichis supported by endless chaiu'l and thecrane-arm 1'. n I

The practical lresult of theforegoing arrangement is to relieve thecrane from the injury which has heretofore resulted from the action ofthe hammer upon the metal resting upon chain T.

Carriage 1t is combined'wit'h an arrangement of chain pulleys andgearing for 'running it'bacli and forth t0 bring the metal bar or mass Cinto the desired position to he forged or to be unloaded..

When the crane-arm is to be raised, Wateris pumped 'into the cylinder c,thereby forcing up the piston H, together with the husk or case d,crane-arms, and the mass or bar of metal C, supported by the windlass S,(see red lines, iig. 1.)

It requires but little expense to t a. base for supporting the post ot"'a 'hydraulic crane made according to my invention, While it isnotliable to get out of order, and the post itself` can be supported in avery firm and substantial manner. v

My improved hydraulic crane has been 4put to a 'practical test, and hasproved highly satisfactory, so much so that the United States Governmenthave adopted it;

Having described my improved hydraulic crane, what I claim therein asnew and of my invention, and desire to secure by Letters Patent, is-Y 1. The combination, with the revolving post e, of the projection b andthe cylinder c, substantially as shownand desc1ibed. p y c v v 2. Thecombination, with the crane-post and its husk-case or shell, of thepiston vH and cylinder c, substantially as and for the purposes setforth. l

3. The combination, witli thc tube B, attached to the lower end of thecrane-post, ofthe nuts 1 4, knee a, and leather packing 5, said partsbeing arranged in relation to each other, substantially as described,and as shown in iig. 4 of the accompanying drawings, and for thepurposes set forth.

4. The combination, with the part 11 of the carriage n and Windlass S,of the cushion O', as shown and described. f i

SAML K. WELLMAN.

Witnesses:

AUGUSTUS Winnn,

FRANKLIN MUNnon.

